Yellowish/Brown spots on leaves and necrosis

Hi,

Yet another problem with my plants, some spots have been appearing on the lower leaves and they are getting bigger. There is also some necrosis on the side of the affected leaves.

Anyone any idea what this could be? I've done a lot of searching online but have come up with nothing.

Any help would be greatly appreciated

Could be a nitrogen deficiency, could be a potasium deficiency. Could also be something simple like overwatering. How dry is the soil when you water?
You should water when the soil is dry about 2-3 inches deep and when you do water, only put enough water in so that just a few drops come out of the holes in the bottom of your pot, you don't want it to be pissing out the bottom. Also check the PH level of your soil and the PH level of the water your about to put in on next watering. The wrong PH level in your soil leads to nutes being locked out.

Anyone else want to add anything to this one??